Nanolithography (NL) is a growing field of techniques within nanotechnology dealing with the engineering (patterning e.g. etching, depositing, writing, printing etc) of nanometer-scale structures on various materials.
The modern term reflects on a design of structures built in range of 10<sup>−9</sup> to 10<sup>−6</sup> meters, i.e. nanometer scale. Essentially, the field is a derivative of lithography, only covering very small structures. All NL methods can be categorized into four groups: photo lithography, scanning lithography, soft lithography and other miscellaneous techniques.
History
Nanolithography has evolved from the need to increase the number of sub-micrometer features (e.g. transistors, capacitors etc.) in an integrated circuit in order to keep up with Moore's Law. While lithographic techniques have been around since the late 18th century, none were applied to nanoscale structures until the mid-1950s. With evolution of the semiconductor industry, demand for techniques capable of producing micro- and nano-scale structures skyrocketed. Photolithography was applied to these structures for the first time in 1958 beginning the age of nanolithography.
Since then, photolithography has become the most commercially successful technique, capable of producing sub-100 nm patterns. There are several techniques associated with the field, each designed to serve its many uses in the medical and semiconductor industries. Breakthroughs in this field contribute significantly to the advancement of nanotechnology, and are increasingly important today as demand for smaller and smaller computer chips increases. Further areas of research deal with physical limitations of the field, energy harvesting, and photonics. by optical means, using a red laser diode (λ = 650 nm). Complex patterns like geometrical figures and letters were obtained at 3 nm resolution on resist substrate. The method was applied to nanopattern graphene at 20 nm resolution.
Scanning lithography
Electron-beam lithography
Electron beam lithography (EBL) or electron-beam direct-write lithography (EBDW) scans a focused beam of electrons on a surface covered with an electron-sensitive film or resist (e.g. PMMA or HSQ) to draw custom shapes. By changing the solubility of the resist and subsequent selective removal of material by immersion in a solvent, sub-10 nm resolutions have been achieved. This form of direct-write, maskless lithography has high resolution and low throughput, limiting single-column e-beams to photomask fabrication, low-volume production of semiconductor devices, and research and development. Multiple-electron beam approaches have as a goal an increase of throughput for semiconductor mass-production.
EBL can be utilized for selective protein nanopatterning on a solid substrate, aimed for ultrasensitive sensing. Resists for EBL can be hardened using sequential infiltration synthesis (SIS).
Scanning probe lithography
Scanning probe lithography (SPL) is another set of techniques for patterning at the nanometer-scale down to individual atoms using scanning probes, either by etching away unwanted material, or by directly-writing new material onto a substrate. Some of the important techniques in this category include dip-pen nanolithography, thermochemical nanolithography, thermal scanning probe lithography, and local oxidation nanolithography. Dip-pen nanolithography is the most widely used of these techniques.
Proton beam writing
This technique uses a focused beam of high energy (MeV) protons to pattern resist material at nanodimensions and has been shown to be capable of producing high-resolution patterning well below the 100 nm mark.
Charged-particle lithography
This set of techniques include ion- and electron-projection lithographies. Ion beam lithography uses a focused or broad beam of energetic lightweight ions (like He<sup>+</sup>) for transferring pattern to a surface. Using Ion Beam Proximity Lithography (IBL) nano-scale features can be transferred on non-planar surfaces.
Soft lithography
Soft lithography uses elastomer materials made from different chemical compounds such as polydimethylsiloxane. Elastomers are used to make a stamp, mold, or mask (akin to photomask) which in turn is used to generate micro patterns and microstructures. The techniques described below are limited to one stage. The consequent patterning on the same surfaces is difficult due to misalignment problems. The soft lithography isn't suitable for production of semiconductor-based devices as it's not complementary for metal deposition and etching. The methods are commonly used for chemical patterning.
Nanosphere lithography
Nanosphere lithography uses self-assembled monolayers of spheres (typically made of polystyrene) as evaporation masks. This method has been used to fabricate arrays of gold nanodots with precisely controlled spacings.
Neutral particle lithography
Neutral particle lithography (NPL) uses a broad beam of energetic neutral particle for pattern transfer on a surface.
Plasmonic lithography
Plasmonic lithography uses surface plasmon excitations to generate beyond-diffraction limit patterns, benefiting from subwavelength field confinement properties of surface plasmon polaritons.
Stencil lithography
Stencil lithography is a resist-less and parallel method of fabricating nanometer scale patterns using nanometer-size apertures as shadow-masks.